Epicyclic geartrain
AssigneeROLLS-ROYCE plc
InventorChloe J Palmer
Life of this patent
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Abstract
An epicyclic geartrain comprises a sun gear, a plurality of planet gears, and a ring gear. The plurality of planet gears is supported by a planet torque ring. The planet gears meshingly surround the sun gear, and the ring gear meshingly surrounds the planet gears. At least one of the sun gear, the plurality of planet gears, and the ring gear, is provided with a plurality of permanent magnet portions. Each of the plurality of magnet portions is arranged as a circumferential array. The planet torque ring is provided with at least one stator coil array, with the or each stator coil array being positioned in axial alignment with the or each corresponding plurality of permanent magnet portions as an axial flux electric motor generator element.
Claims11
An epicyclic geartrain comprising:
- a sun gear;
- a plurality of planet gears supported by a planet torque ring;
- and
- a ring gear, wherein:
- the planet gears meshingly surround the sun gear;
- the ring gear meshingly surrounds the planet gears;
- at least the sun gear is provided with a plurality of permanent magnet portions arranged as a circumferential array;
- and
- the planet torque ring is provided with at least one stator coil array, the or each stator coil array being positioned in axial alignment with the or each corresponding plurality of permanent magnet portions as an axial flux electric motor generator element.
An epicyclic geartrain comprising:
- a sun gear;
- a plurality of planet gears supported by a planet torque ring;
- and
- a ring gear, wherein:
- the planet gears meshingly surround the sun gear;
- the ring gear meshingly surrounds the planet gears;
- at least one of the sun gear, the plurality of planet gears, and the ring gear is provided with a plurality of permanent magnet portions arranged as a circumferential array;
- the planet torque ring is provided with at least one stator coil array, the or each stator coil array being positioned in axial alignment with the or each corresponding plurality of permanent magnet portions as an axial flux electric motor generator element;
- and
- each stator coil array comprises at least six coil portions, the six coil portions being arranged as a circumferential array.
A geared turbofan engine comprising:
- a fan;
- a core gas turbine engine;
- and
- a gearbox,
- wherein the gearbox connects the fan to the core gas turbine engine, and the gearbox comprises an epicyclic geartrain comprising:
- a sun gear;
- a plurality of planet gears supported by a planet torque ring;
- and
- a ring gear, wherein:
- the planet gears meshingly surround the sun gear;
- the ring gear meshingly surrounds the planet gears;
- at least one of the sun gear, the plurality of planet gears, and the ring gear is provided with a plurality of permanent magnet portions arranged as a circumferential array;
- and
- the planet torque ring is provided with at least one stator coil array, the or each stator coil array being positioned in axial alignment with the or each corresponding plurality of permanent magnet portions as an axial flux electric motor generator element.
Dependencies are inferred from the claim text.